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Postmenopausal hormone replacement therapy and the primary prevention of cardiovascular disease
Linda L Humphrey1, Benjamin K S Chan, Harold C Sox
1Veterans Affairs Medical Center and Oregon Health & Science University, Portland, Oregon 97201, USA.
Insights
Hormone replacement therapy (HRT) does not appear to prevent cardiovascular disease (CVD) or coronary artery disease (CAD). Further research using randomized controlled trials is needed to confirm the role of HRT in primary CVD prevention.
Area of Science:
- Cardiovascular Medicine
- Endocrinology
- Preventive Medicine
Background:
- Hormone replacement therapy (HRT) has been investigated for its potential role in preventing cardiovascular disease (CVD).
- Previous studies have yielded conflicting results regarding the efficacy of HRT in primary prevention of CVD and coronary artery disease (CAD).
Purpose of the Study:
- To evaluate the effectiveness of hormone replacement therapy (HRT) in the primary prevention of cardiovascular disease (CVD) and coronary artery disease (CAD).
Main Methods:
- A comprehensive literature search of MEDLINE and Cochrane databases was conducted for primary prevention studies on HRT, CVD, and CAD.
- Studies were reviewed, abstracted, and quality-rated using U.S. Preventive Services Task Force (USPSTF) criteria.
- Meta-analysis was performed on good or fair quality studies, with further analysis adjusting for potential confounding factors.
Main Results:
- The summary relative risk for CVD mortality with HRT was 0.75 (95% CrI, 0.42-1.23) and for CAD mortality was 0.74 (95% CrI, 0.36-1.45).
- Summary relative risk for CVD incidence was 1.28 (95% CrI, 0.86-2.00) and for CAD incidence was 0.87 (95% CrI, 0.62-1.21).
- Adjusted analyses indicated no significant benefit of HRT for CAD incidence, suggesting confounding by socioeconomic status, alcohol consumption, and exercise.
Conclusions:
- This meta-analysis suggests that HRT does not provide a benefit in the primary prevention of CVD or CAD.
- Findings align with recent randomized trials indicating no protective effect of HRT on CVD events.
- Randomized, controlled trials are essential to definitively determine the role of HRT in primary CVD prevention.
Purpose:
To evaluate the value of hormone replacement therapy (HRT) in the primary prevention of cardiovascular disease (CVD) and coronary artery disease (CAD).
Data Sources:
MEDLINE and Cochrane databases were searched for all primary prevention studies reporting CVD or CAD incidence, mortality, or both in association with HRT; reference lists, letters, editorials, and reviews were also reviewed.
Data Extraction:
All studies were reviewed, abstracted, and rated for quality.
Study Selection:
Only studies of good or fair quality, according to U.S. Preventive Services Task Force (USPSTF) criteria, were included in the detailed review and meta-analysis.
Data Synthesis:
The summary relative risk with any HRT use was 0.75 (95% credible interval [CrI], 0.42 to 1.23) for CVD mortality and 0.74 (CrI, 0.36 to 1.45) for CAD mortality. The summary relative risk with any use was 1.28 (CrI, 0.86 to 2.00) for CVD incidence and 0.87 (CrI, 0.62 to 1.21) for CAD incidence. Further analysis of studies adjusting for socioeconomic status, as well as other major CAD risk factors, showed a summary relative risk of 1.07 (CrI, 0.79 to 1.48) for CAD incidence associated with any HRT use. Similar results were found when the analysis was stratified by studies adjusting for alcohol consumption, exercise, or both, in addition to other major risk factors, suggesting confounding by these factors.
Conclusions:
This meta-analysis differs from previous meta-analyses by evaluating potential explanatory variables of the relationship between HRT, CVD, and CAD. The adjusted meta-analysis is consistent with recent randomized trials that have shown no benefit in the secondary or primary prevention of CVD events. A valid answer to the role of HRT in the primary prevention of CVD will best come from randomized, controlled trials.
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